[linux-azure] [SRU] UBUNTU: SAUCE: Drivers: hv: vmbus: Add timeout to vmbus_wait_for_unload

[Joseph Salisbury]

[Impact]

This is a request to inclue a patch, submitted to the upstream linux-hyperv mailing list, in the linux-azure kernels.

Microsoft would like to request this patch in the 16.04 (4.15) and newer azure kernels. This patch fixes a prior commit, hence the SRU request:

Fixes: 415719160de3 ("Drivers: hv: vmbus: avoid scheduling in interrupt context in vmbus_initiate_unload()")

The patch specfically performs the following:

"vmbus_wait_for_unload() looks for a CHANNELMSG_UNLOAD_RESPONSE message coming from Hyper-V. But if the message isn't found for some reason, the panic path gets hung forever. Add a timeout of 10 seconds to prevent this."

The requested patch can be found at:
https://lkml.org/lkml/2020/9/13/196

[Test Case]

Since the problem depends on a communication failure with the host. I recommend testing for regressions. The change affects when the module is removed or the system is suspended.

[Regression Potential]

The change affects the panic path and suspend so any regressions shouldn't be critical.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-azure - 5.4.0-1031.32

---------------
linux-azure (5.4.0-1031.32) focal; urgency=medium

  [ Ubuntu: 5.4.0-51.56 ]

  * Packaging resync (LP: #1786013)
    - update dkms package versions

linux-azure (5.4.0-1030.31) focal; urgency=medium

  [ Ubuntu: 5.4.0-50.55 ]

  * CVE-2020-16119
    - SAUCE: dccp: avoid double free of ccid on child socket
  * CVE-2020-16120
    - Revert "UBUNTU: SAUCE: overlayfs: ensure mounter privileges when reading
      directories"
    - ovl: pass correct flags for opening real directory
    - ovl: switch to mounter creds in readdir
    - ovl: verify permissions in ovl_path_open()
    - ovl: call secutiry hook in ovl_real_ioctl()
    - ovl: check permission to open real file

linux-azure (5.4.0-1029.29) focal; urgency=medium

  * focal/linux-azure: 5.4.0-1029.29 -proposed tracker (LP: #1897102)

  * btrfs: trimming a btrfs device which has been shrunk previously fails and
    fills root disk with garbage data (LP: #1896154)
    - btrfs: trim: fix underflow in trim length to prevent access beyond device
      boundary

  * Mellanox patch for fixing failures in ConnectX3 Pro/DPDK (LP: #1896760)
    - RDMA/mlx4: Read pkey table length instead of hardcoded value

linux-azure (5.4.0-1027.27) focal; urgency=medium

  * focal/linux-azure: 5.4.0-1027.27 -proposed tracker (LP: #1895994)

  * Focal update: v5.4.61 upstream stable release (LP: #1893115)
    - azure: [Config] update config for SPI_DYNAMIC

  * Unexpected warning when hibernating (LP: #1895980)
    - x86/hyperv: Properly suspend/resume reenlightenment notifications

  * [linux-azure] [SRU] UBUNTU: SAUCE: Drivers: hv: vmbus: Add timeout to
    vmbus_wait_for_unload (LP: #1895527)
    - SAUCE: Drivers: hv: vmbus: Add timeout to vmbus_wait_for_unload

  [ Ubuntu: 5.4.0-49.53 ]

  * focal/linux: 5.4.0-49.53 -proposed tracker (LP: #1896007)
  * Comet Lake PCH-H RAID not support on Ubuntu20.04 (LP: #1892288)
    - ahci: Add Intel Comet Lake PCH-H PCI ID
  * Novalink (mkvterm command failure) (LP: #1892546)
    - tty: hvcs: Don't NULL tty->driver_data until hvcs_cleanup()
  * Oops and hang when starting LVM snapshots on 5.4.0-47 (LP: #1894780)
    - SAUCE: Revert "mm: memcg/slab: fix memory leak at non-root kmem_cache
      destroy"
  * Intel x710 LOMs do not work on Focal (LP: #1893956)
    - i40e: Fix LED blinking flow for X710T*L devices
    - i40e: enable X710 support
  * Add/Backport EPYC-v3 and EPYC-Rome CPU model (LP: #1887490)
    - kvm: svm: Update svm_xsaves_supported
  * Fix non-working NVMe after S3 (LP: #1895718)
    - SAUCE: PCI: Enable ACS quirk on CML root port
  * Focal update: v5.4.65 upstream stable release (LP: #1895881)
    - ipv4: Silence suspicious RCU usage warning
    - ipv6: Fix sysctl max for fib_multipath_hash_policy
    - netlabel: fix problems with mapping removal
    - net: usb: dm9601: Add USB ID of Keenetic Plus DSL
    - sctp: not disable bh in the whole sctp_get_port_local()
    - taprio: Fix using wrong queues in gate mask
    - tipc: fix shutdown() of connectionless socket
    - net: disable netpoll on fresh napis
    - Linux 5.4.65
  * Focal update: v5.4.64 upstream stable release (LP: #1895...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-azure-4.15 - 4.15.0-1099.110

---------------
linux-azure-4.15 (4.15.0-1099.110) bionic; urgency=medium

  [ Ubuntu: 4.15.0-121.123 ]

  * Packaging resync (LP: #1786013)
    - update dkms package versions

linux-azure-4.15 (4.15.0-1098.109) bionic; urgency=medium

  [ Ubuntu: 4.15.0-120.122 ]

  * CVE-2020-16119
    - SAUCE: dccp: avoid double free of ccid on child socket
  * CVE-2020-16120
    - Revert "UBUNTU: SAUCE: overlayfs: ensure mounter privileges when reading
      directories"
    - ovl: pass correct flags for opening real directory
    - ovl: switch to mounter creds in readdir
    - ovl: verify permissions in ovl_path_open()

linux-azure-4.15 (4.15.0-1097.107) bionic; urgency=medium

  * bionic/linux-azure-4.15: 4.15.0-1097.107 -proposed tracker (LP: #1896026)

  * Bionic update: upstream stable patchset 2020-09-11 (LP: #1895328)
    - [Config] azure-4.15: updateconfigs for CONFIG_SPI_DYNAMIC

  * [linux-azure] [SRU] UBUNTU: SAUCE: Drivers: hv: vmbus: Add timeout to
    vmbus_wait_for_unload (LP: #1895527)
    - SAUCE: Drivers: hv: vmbus: Add timeout to vmbus_wait_for_unload

  [ Ubuntu: 4.15.0-119.120 ]

  * bionic/linux: 4.15.0-119.120 -proposed tracker (LP: #1896040)
  * gtp: unable to associate contextes to interfaces (LP: #1894605)
    - gtp: add GTPA_LINK info to msg sent to userspace
  * uvcvideo: add mapping for HEVC payloads (LP: #1895803)
    - media: videodev2.h: Add v4l2 definition for HEVC
    - SAUCE: media: uvcvideo: Add mapping for HEVC payloads
  * Novalink (mkvterm command failure) (LP: #1892546)
    - tty: hvcs: Don't NULL tty->driver_data until hvcs_cleanup()
  * rtnetlink.sh in net from ubuntu_kernel_selftests is returning 1 for a
    skipped test (LP: #1895258)
    - selftests: net: return Kselftest Skip code for skipped tests
  * Bionic update: upstream stable patchset 2020-09-16 (LP: #1895873)
    - net: Fix potential wrong skb->protocol in skb_vlan_untag()
    - tipc: fix uninit skb->data in tipc_nl_compat_dumpit()
    - ipvlan: fix device features
    - gre6: Fix reception with IP6_TNL_F_RCV_DSCP_COPY
    - ALSA: pci: delete repeated words in comments
    - ASoC: tegra: Fix reference count leaks.
    - mfd: intel-lpss: Add Intel Emmitsburg PCH PCI IDs
    - arm64: dts: qcom: msm8916: Pull down PDM GPIOs during sleep
    - powerpc/xive: Ignore kmemleak false positives
    - media: pci: ttpci: av7110: fix possible buffer overflow caused by bad DMA
      value in debiirq()
    - blktrace: ensure our debugfs dir exists
    - scsi: target: tcmu: Fix crash on ARM during cmd completion
    - iommu/iova: Don't BUG on invalid PFNs
    - drm/amdkfd: Fix reference count leaks.
    - drm/radeon: fix multiple reference count leak
    - drm/amdgpu: fix ref count leak in amdgpu_driver_open_kms
    - drm/amd/display: fix ref count leak in amdgpu_drm_ioctl
    - drm/amdgpu: fix ref count leak in amdgpu_display_crtc_set_config
    - drm/amdgpu/display: fix ref count leak when pm_runtime_get_sync fails
    - scsi: lpfc: Fix shost refcount mismatch when deleting vport
    - selftests/powerpc: Purge extra count_pmc() calls of ebb selftests
    - omapfb: fix multiple reference count leak...

[Marcelo Cerri (mhcerri)]

Fix was already applied to groovy:linux-azure via upstream stable update (LP:#1896795).

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-azure - 4.15.0-1098.109~16.04.1

---------------
linux-azure (4.15.0-1098.109~16.04.1) xenial; urgency=medium

  [ Ubuntu: 4.15.0-1098.109 ]

  * CVE-2020-16119
    - SAUCE: dccp: avoid double free of ccid on child socket
  * CVE-2020-16120
    - Revert "UBUNTU: SAUCE: overlayfs: ensure mounter privileges when reading
      directories"
    - ovl: pass correct flags for opening real directory
    - ovl: switch to mounter creds in readdir
    - ovl: verify permissions in ovl_path_open()

linux-azure (4.15.0-1097.107~16.04.1) xenial; urgency=medium

  * xenial/linux-azure: 4.15.0-1097.107~16.04.1 -proposed tracker (LP: #1896024)

  [ Ubuntu: 4.15.0-1097.107 ]

  * bionic/linux-azure-4.15: 4.15.0-1097.107 -proposed tracker (LP: #1896026)
  * Bionic update: upstream stable patchset 2020-09-11 (LP: #1895328)
    - [Config] azure-4.15: updateconfigs for CONFIG_SPI_DYNAMIC
  * [linux-azure] [SRU] UBUNTU: SAUCE: Drivers: hv: vmbus: Add timeout to
    vmbus_wait_for_unload (LP: #1895527)
    - SAUCE: Drivers: hv: vmbus: Add timeout to vmbus_wait_for_unload
  * bionic/linux: 4.15.0-119.120 -proposed tracker (LP: #1896040)
  * gtp: unable to associate contextes to interfaces (LP: #1894605)
    - gtp: add GTPA_LINK info to msg sent to userspace
  * uvcvideo: add mapping for HEVC payloads (LP: #1895803)
    - media: videodev2.h: Add v4l2 definition for HEVC
    - SAUCE: media: uvcvideo: Add mapping for HEVC payloads
  * Novalink (mkvterm command failure) (LP: #1892546)
    - tty: hvcs: Don't NULL tty->driver_data until hvcs_cleanup()
  * rtnetlink.sh in net from ubuntu_kernel_selftests is returning 1 for a
    skipped test (LP: #1895258)
    - selftests: net: return Kselftest Skip code for skipped tests
  * Bionic update: upstream stable patchset 2020-09-16 (LP: #1895873)
    - net: Fix potential wrong skb->protocol in skb_vlan_untag()
    - tipc: fix uninit skb->data in tipc_nl_compat_dumpit()
    - ipvlan: fix device features
    - gre6: Fix reception with IP6_TNL_F_RCV_DSCP_COPY
    - ALSA: pci: delete repeated words in comments
    - ASoC: tegra: Fix reference count leaks.
    - mfd: intel-lpss: Add Intel Emmitsburg PCH PCI IDs
    - arm64: dts: qcom: msm8916: Pull down PDM GPIOs during sleep
    - powerpc/xive: Ignore kmemleak false positives
    - media: pci: ttpci: av7110: fix possible buffer overflow caused by bad DMA
      value in debiirq()
    - blktrace: ensure our debugfs dir exists
    - scsi: target: tcmu: Fix crash on ARM during cmd completion
    - iommu/iova: Don't BUG on invalid PFNs
    - drm/amdkfd: Fix reference count leaks.
    - drm/radeon: fix multiple reference count leak
    - drm/amdgpu: fix ref count leak in amdgpu_driver_open_kms
    - drm/amd/display: fix ref count leak in amdgpu_drm_ioctl
    - drm/amdgpu: fix ref count leak in amdgpu_display_crtc_set_config
    - drm/amdgpu/display: fix ref count leak when pm_runtime_get_sync fails
    - scsi: lpfc: Fix shost refcount mismatch when deleting vport
    - selftests/powerpc: Purge extra count_pmc() calls of ebb selftests
    - omapfb: fix multiple reference count leaks due to pm_runtime_get_sync
    - PCI: Fix pci_create_slot() reference...